This 17 piece bearing race and seal driver kit is suitable for the installation of straight races and seals into brake disc hubs without damage to the bearing or axle housing the collars will fit most standard wheel bearing sizes including 4x4 vehicles and are made from machined aluminium the kit comes in a handy carrying case for quick and easy storagethere are three driver sizes are used with a small hammer to insert the new straight race into the brake disc hub the adaptor should sit snu